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作者： Liu, J.W. Yue, T.M. Guo, Z.N. Zhang, Y.J. State Key Lab of Pulp and Paper Engineering South China University of Technology Guangzhou510640 China Advanced Manufacturing Technology Research Centre Department of Industrial and Systems Engineering Hong Kong Polytechnic University Hung Hom Hong Kong Faculty of Electromechanical Engineering Guangdong University of Technology Guangzhou510090 China

The main objective of this investigation is to study the influence of the processing medium and gap distance on the electrical discharge machining process performance while machining metal matrix composite materials. Machining characteristic of electrical discharge machining in air and emulsified oil medium has been compared. The effects of medium, gap distance on the crater size have been studied. The study shows that the discharge modes in both of the medium are all in the form of an arc. And it was also found that the material removal rate of EDM in emulsified oil was considerable higher (about 300%) than that in air medium under the experimental conditions of this study. Moreover, in both air and emulsified oil medium, more molten materials can be flushed out if the gap distance has been enlarged. © W. S. Maney & Son Ltd 2015.

关键词： Electric discharges

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A 30 mm Wide DC-Driven Brush-Shaped Cold Air Plasma Without Airflow Supplement

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Plasma Science and technology 2014年第4期16卷 329-334页

作者：陈兆权郑晓亮夏广庆李平胡业林杜志文祝龙记刘明海陈明功胡希伟 College of Electrical&Information Engineering Anhui University of Science and Technology State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology

This paper reports a cold atmospheric pressure DC-driven air plasma brush. Three stainless steel needles are symmetrically mounted on a slot shaped PVC slab to act as the elec- trodes. The brush driven by a direct current （DC） power supply can generate an air plasma glow up to 30 mm wide with no inert gas addition and no air flow supplement. The plasma glow appears uniform no matter what kinds of material are processed. The measured current and the simulated current all show that each pulsed discharge including two peaks always oc- curs for different gaps between electrodes. Emission spectra measurement result shows that the obtained rotational temperatures are 300 K and the vibrational temperatures are 2250 K. Some reactive species are presented in the plasma glow, which suggest that the proposed plasma brush is beneficial to practical applications.

关键词： atmospheric pressure plasma cold plasma plume DC-driven discharge airplasma

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44-2: Ultra-Thin High-Dichroic-Ratio Polarizer Generated by Photoalignment

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SID Symposium Digest of Technical Papers 2016年第1期47卷

作者： Su Pan Jacob Y. Ho Vladimir G. Chigrinov Hoi-Sing Kwok State Key Lab on Advanced Displays and Optoelectronics Department of Electronic and Computer Engineering Hong Kong University of Science & Technology

A dichroic polarizer with a high dichroic ratio of up to 60 is achieved by photoalignment induced anisotropic azo dye ordering. The film thickness is well controlled in 200 nm, and it is 500 times thinner than a conventional iodine Polaroid polarizer, which is desirable for ultra-thin high performance liquid crystal display applications.

关键词： Polarizer dichroic ratio photoalignment azo dye

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Minimum energy storage for power system with high wind power penetration using p-efficient point theory

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Science China(Information Sciences) 2014年第12期57卷 243-254页

作者： LI JingHua WEN JinYu CHENG ShiJie WEI Hua State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology School of Electrical Engineering Guangxi University

Minimum energy storage(ES)and spinning reserve(SR)for day-ahead power system scheduling with high wind power penetration is significant for system operations.A chance-constrained energy storage optimization model based on unit commitment and considering the stochastic nature of both the wind power and load demand is *** solve this proposed chance-constrained model,it is first converted into a deterministic-constrained model using p-efficient point theory.A single stochastic net load variable is developed to represent the stochastic characteristics of both the wind power and load demand for convenient use with the p-efficient point theory.A probability distribution function for netload forecast error is obtained via the Kernel estimation *** proposed model is applied to a wind-thermal-storage combined power system.A set of extreme scenarios is chosen to validate the effectiveness of the proposed model and *** results indicate that the scheduled energy storage can effectively compensate for the net load forecast error,and the increasing wind power penetration does not necessarily require a linear increase in energy storage.

关键词： energy storage spinning reserve wind power penetration chance constraints p-efficient theory kernel estimation

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Low-order harmonics analysis and suppression method for 400Hz single-phase VSI

Low-order harmonics analysis and suppression method for 400H...

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Annual IEEE Conference on Applied Power Electronics Conference and Exposition (APEC)

作者： Guoqing Yuan Siqin Luo Shiying Zhou Xudong Zou Kaifeng Zou State Key Laboratory of Advanced Electromagnetic Engineering and Technology HUST Wuhan Hubei China Qingdao Branch of Naval Aeronautical Engineering Institute Qingdao Shandong China

ISBN: (纸本)9781479967360

It is necessary to insert a dead-time in sinusoidal pulse width modulation (SPWM) voltage source inverter (VSI) to prevent a short circuit in the DC link. However, this will cause the dead-time effect, drop the fundamental voltage and introduce the 3 rd , 5 th and 7 th low-order harmonics into the output voltage. Conventional dead-time compensation methods either average voltage based or inductor current feedback compensation cannot be adopted in the case of high inductor ripple current. Moreover, even with high-precision detection of the inductor current polarity, the conventional methods are still not suitable when unipolar frequency doubling SPWM method is adopted. Dead-time effect is different when different SPWM methods are used. In this paper, dead-time effect of unipolar frequency doubling SPWM is analyzed and a new approach for eliminating low-order harmonics is proposed. Simulation and experiment on a 400-Hz prototype both show satisfactory results and verify the validity of the analysis and the effectiveness of the proposed control method.

关键词： Inductors Power harmonic filters Harmonic analysis Inverters Voltage control Resonant frequency Delays

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Structure and Electronic Properties of Fe2SH3 Compound under High Pressure

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Inorganic chemistry 2016年第21期55卷 11434-11439页

作者： Shoutao Zhang Li Zhu Hanyu Liu Guochun Yang Centre for Advanced Optoelectronic Functional Materials Research and Key Laboratory for UV Light-Emitting Materials and Technology of Ministry of Education Northeast Normal University Changchun 130024 China. State Key Laboratory of Superhard Materials Jilin University Changchun 130012 China. Geophysical Lab Carnegie Institution of Washington Washington District of Columbia 20015 United States. Department of Physics and Engineering Physics University of Saskatchewan Saskatoon Canada S7N 5E2.

Inspired by the diverse properties of hydrogen sulfide, iron sulfide, and iron hydrides, we combine first-principles calculations with structure prediction to find stable structures of Fe-S-H ternary compounds with various FeSH (x = 1-2; y = 1-2; z = 1-6) compositions under high pressure with the aim of finding novel functional materials. It is found that FeSH composition stabilizes into an orthorhombic structure with Cmc2 symmetry, whose remarkable feature is that it contains dumbbell-type Fe with an Fe-Fe distance of 2.435 Å at 100 GPa, and S and H atoms directly bond with the Fe atoms exhibiting ionic bonding. The high density of states at the Fermi level, mainly coming from the contribution of Fe-3d, indicates that it satisfies the Stoner ferromagnetic condition. Notably, its ferromagnetic ordering gradually decreases with increasing pressure, and eventually collapses at a pressure of 173 GPa. As a consequence, magnetic and nonmagnetic transition can be achieved by controlling the pressure. In addition, there is a very weak electron-phonon coupling in Cmc2-structured FeSH. The different superconducting mechanisms between FeSH and HS were compared and analyzed.

关键词： Band structure Electronic structure Crystal structure Chemical structure Stability

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Optimizing the balance of holes and electrons in inverted quantum dot light-emitting diodes by inserting electron transportation barrier layer

Optimizing the balance of holes and electrons in inverted qu...

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2015 SID International Symposium

作者： Jiang, Yibin Tang, Haoning Chen, Shuming Kwok, Hoi-Sing State Key Lab. on Advanced Displays and Optoelectronics Department of Electronic and Computer Engineering Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong Department of Electrical and Electronic Engineering South University of Science and Technology of China Shenzhen518055 China

In this study, the hole-electron balance of quantum dot light-emitting diodes (QDLED) was tuned in order to achieve efficiency enhancement This hole-electron balance optimization was realized by inserting thin barrier layer in the electron transportation layer. Although the current density was slightly sacrificed because of the electron blocking of the barrier layer, the charge balance was improved hence leading to 123% efficiency enhancement. © 2015 SID.

关键词： Semiconductor quantum dots

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Challenging local realism with human choices

arXiv

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arXiv 2018年

作者： Abellán, C. Acín, A. Alarcón, A. Alibart, O. Andersen, C.K. Andreoli, F. Beckert, A. Beduini, F.A. Bendersky, A. Bentivegna, M. Bierhorst, P. Burchardt, D. Cabello, A. Cariñe, J. Carrasco, S. Carvacho, G. Cavalcanti, D. Chaves, R. Cortés-Vega, J. Cuevas, A. Delgado, A. de Riedmatten, H. Eichler, C. Farrera, P. Fuenzalida, J. García-Matos, M. Garthoff, R. Gasparinetti, S. Gerrits, T. GhafariJouneghani, F. Glancy, S. Gómez, E.S. González, P. Guan, J.-Y. Handsteiner, J. Heinsoo, J. Heinze, G. Hirschmann, A. Jiménez, O. Kaiser, F. Knill, E. Knoll, L.T. Krinner, S. Kurpiers, P. Larotonda, M.A. Larsson, J.-Å. Lenhard, A. Li, H. Li, M.-H. Lima, G. Liu, B. Liu, Y. López Grande, I.H. Lunghi, T. Ma, X. Magaña-Loaiza, O.S. Magnard, P. Magnoni, A. Martí-Prieto, M. Martínez, D. Mataloni, P. Mattar, A. Mazzera, M. Mirin, R.P. Mitchell, M.W. Nam, S. Oppliger, M. Pan, J.-W. Patel, R.B. Pryde, G.J. Rauch, D. Redeker, K. Rieländer, D. Ringbauer, M. Roberson, T. Rosenfeld, W. Salathé, Y. Santodonato, L. Sauder, G. Scheidl, T. Schmiegelow, C.T. Sciarrino, F. Seri, A. Shalm, L.K. Shi, S.-C. Slussarenko, S. Stevens, M.J. Tanzilli, S. Toledo, F. Tura, J. Ursin, R. Vergyris, P. Verma, V.B. Walter, T. Wallraff, A. Wang, Z. Weinfurter, H. Weston, M.M. White, A.G. Wu, C. Xavier, G.B. You, L. Yuan, X. Zeilinger, A. Zhang, Q. Zhang, W. Zhong, J. 08860 Spain ICREA Institució Catalana de Recerca i Estudis Avançats Barcelona08010 Spain Center for Optics and Photonics MSI-Nucleus for Advanced Optics Universidad de Concepción Casilla 4016 Concepción Chile Departamento de Ingeniería Eléctrica Universidad de Concepción 160-C Concepción Chile Parc Valrose Nice Cedex 206108 France Quantum Device Lab Department of Physics ETH Zurich ZurichCH-8093 Switzerland Dipartimento di Fisica Sapienza Università di Roma RomaI-00185 Italy Departamento de Computación FCEyN UBA and ICC CONICET Ciudad Universitaria Pabellón 1 Buenos Aires1428 Argentina National Institute of Standards and Technology 325 Broadway BoulderCO80305 United States Ludwig-Maximilians-Universität München80799 Germany Departamento de Física Aplicada II Universidad de Sevilla Sevilla41012 Spain Departamento de Física Universidad de Concepción 160-C Concepción Chile International Institute of Physics Federal University of Rio Grande do Norte Natal59070-405 Brazil Austrian Academy of Sciences Boltzmanngasse 3 Vienna1090 Austria Centre for Quantum Computation and Communication Technology Griffith University BrisbaneQLD4111 Australia Centre for Quantum Dynamics Griffith University BrisbaneQLD4111 Australia Shanghai Branch National Laboratory for Physical Sciences at Microscale Dept. of Modern Physics University of Science and Technology of China Shanghai230026 China DEILAP CITEDEF & CONICET J.B. de La Salle 4397 1603 Villa Martelli Buenos Aires Argentina Departamento de Física FCEyN UBA and IFIBA Ciudad Universitaria Conicet Pabellón 1 Buenos Aires1428 Argentina Department of Electrical Engineering Linköping University Linköping581 83 Sweden State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai200050 China CAS Center for Excellence in Superconducting Electronics Shanghai200050 China School of Computer NUDT

A Bell test is a randomized trial that compares experimental observations against the philosophical worldview of local realism1, in which the properties of the physical world are independent of our observation of them and no signal travels faster than light. A Bell test requires spatially distributed entanglement, fast and high-efficiency detection and unpredictable measurement settings2,3. Although technology can satisfy the first two of these requirements4–7, the use of physical devices to choose settings in a Bell test involves making assumptions about the physics that one aims to test. Bell himself noted this weakness in using physical setting choices and argued that human ‘free will’ could be used rigorously to ensure unpredictability in Bell tests8. Here we report a set of local-realism tests using human choices, which avoids assumptions about predictability in physics. We recruited about 100,000 human participants to play an online video game that incentivizes fast, sustained input of unpredictable selections and illustrates Bell-test methodology9. The participants generated 97,347,490 binary choices, which were directed via a scalable web platform to 12 laboratories on five continents, where 13 experiments tested local realism using photons5,6, single atoms7, atomic ensembles10, and superconducting devices11. Over a 12-hour period on 30 November 2016, participants worldwide provided a sustained data flow of over 1,000 bits per second to the experiments, which used different human-generated data to choose each measurement setting. The observed correlations strongly contradict local realism and other realistic positions in bipartite and tripartite12 scenarios. Project outcomes include closing the ‘freedom-of-choice loophole’ (the possibility that the setting choices are influenced by ‘hidden variables’ to correlate with the particle properties13), the utilization of video-game methods14 for rapid collection of human generated randomness, and the use of network

关键词： Testing

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Preliminary Design and Analysis of the DC Reactor for the ITER Converter

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Plasma Science and technology 2014年第3期16卷 273-277页

作者：杨拧张明李传宋执权于克训庄革徐涛 College of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Institute of Plasma Physics Chinese Academy of Sciences

The DC reactor is an important piece of equipment for restraining loop and ripple currents in the international thermonuclear experimental reactor （ITER） converter power supply system. As the reactor is operated at a steady state of 27.5 kA and needs to withstand a peak current of 175 kA, so the design of the DC reactor used in the ITER converter power supply system is necessary. A new water-cooling dry-type air-core reactor is designed in this work. The detailed structural parameters are calculated by theoretical formulas, and then the structure is optimized by electromagnetic simulation with ANSYS. Finally, thermal and dynamic stability analyses are performed to verify the temperature and stress at a rated current of 27.5 kA and pulsed current of 175 kA. The analysis results show that the temperature and stress meet the requirements of the ITER converter power supply system.

关键词： ITER converter reactor electromagnetic simulation thermal stability dy-namic stability

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Optimal Trade-Off Between Regulation and Wind Curtailment in the Economic Dispatch Problem

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CSEE Journal of Power and Energy Systems 2015年第4期1卷 52-60页

作者： Jinghua Li Jiakun Fang Jinyu Wen Yi Pan Qiang Ding State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074China the department of electrical engineering Guangxi UniversityNanning 530004China China Electric Power Research Institute Beijing 100192China

Generator regulation and wind power curtailment are two conflicting ways to deal with the inaccurate prediction and volatility of wind *** study focuses on planning the day-ahead schedule based on optimal trade-off between regulation of generators and wind *** to traditional economic dispatch methods,the proposed schedule is more robust and adaptive to multiple forecast scenarios instead of a single forecast *** works of this paper are as follows:First,an economic dispatch problem based on multiple scenarios is formulated with the objective of minimizing both generator regulation and wind ***,a forecast method for wind power scenarios is ***,the proposed model is verified by comparing with other dispatch models that are based on single forecast *** simulation results demonstrate the effectiveness of the proposed method with less wind curtailment,generator regulation,and operational *** addition,the penalty factors are set as parameters and the influences on the generators’regulation and wind curtailment are analyzed,providing the reference for system operators with different regulatory purposes.

关键词： Economic dispatch forecasting regulation uncertainty wind curtailment wind power scenarios

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